If games are not optimised for the chip, lag will occur. If games aren't properly coded or graphically intensive the phone will use a lot of processing power and heat up quickly. Then it will start throttling the CPU to avoid overheating.

actually on GTA not so many lags as on assassin xD bu gta sucks as his gameplay so not so interesting game, im worry about assassin lag its sometime goes really noticable but still playble but i saw that that game was running smooth on nexus 7 abt interesting wrf with ubisoft that cannot make game optimized x.x or aaah im confused what ti do that not warm phone and makes games smooth

I have recently bought G2 D802 and i have found the same type of lagging in my device to, previously i was using S3 and S4 and gaming was smooth in both of my previous devices. I play games which do not have high graphics like Temple run 2, Granny Smith and Banana Kong.

It is such a costly device and i am ruing the day i bought this device because i also dont like the camera result of my G2, hoping that update will resolve this problem....

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